Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS5647662 A
Publication typeGrant
Application numberUS 08/550,251
Publication dateJul 15, 1997
Filing dateOct 6, 1995
Priority dateOct 6, 1995
Fee statusPaid
Also published asDE69627947D1, DE69627947T2, EP0767398A1, EP0767398B1, US5857768
Publication number08550251, 550251, US 5647662 A, US 5647662A, US-A-5647662, US5647662 A, US5647662A
InventorsByron J. Ziegler, Richard S. Belliveau
Original AssigneeZiegler; Byron J., Belliveau; Richard S.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for cooling a light beam
US 5647662 A
Abstract
Apparatus for cooling a light beam used to project an image on a projection surface. The apparatus includes a light beam source and a gas cooling circuit. A cooling chamber is connected to conduct gas through the circuit. An image projection device is mounted in the chamber. The chamber has a thermally protected environment. A driving device is provided in the circuit. A heat conducting gas is moved by the driving device to circulate within the circuit. The thermally protected environment may include an atmosphere of atomized, heat conducting fluid. A heat extracting filter may be mounted in the light beam adjacent the cooling chamber.
Images(6)
Previous page
Next page
Claims(6)
Having described the invention, what is claimed is:
1. Apparatus for cooling a light beam, comprising:
a) a light beam source that projects a light beam and heat;
b) a gas cooling circuit containing a heat conducting gas;
c) a cooling chamber which is integral to the gas cooling circuit and is placed in the light beam;
d) an image projection device mounted in the cooling chamber;
e) a cooling exchange tower integral to the gas cooling circuit;
f) a liquid cooling circuit, of which the cooling exchange tower is an integral part, containing a liquid coolant;
g) a driving device which moves the gas through the tower, whereby the gas, which absorbs heat in the cooling chamber, is cooled in response to being moved through the liquid coolant in the cooling exchange tower; and
h) a pump device urging the liquid coolant to move through the liquid cooling circuit.
2. The apparatus as defined in claim 1, further comprising:
a heat extracting dichroic filter mounted in the light beam adjacent the cooling chamber.
3. The apparatus as defined in claim 1, further comprising:
a) a heat extracting fluid filter mounted in the light beam, the fluid filter including a glass dome housing adjacent the light beam source, the dome having a conduit formed therein connected for conducting liquid from the tower through the dome; and
b) a pump for moving the liquid through the dome.
4. The apparatus as defined in claim 3, further comprising:
a dichroic coating on a surface of the dome adjacent the light beam source.
5. Apparatus for cooling a light beam, comprising:
a) a light beam source that projects a light beam and radiates heat;
b) a gas cooling circuit containing a heat conducting gas and having a driving device for moving the gas therethrough;
c) a cooling chamber which is integral to the gas cooling circuit and is placed in the light beam;
d) an image projection device mounted in the cooling chamber;
e) the gas being a heat conducting gas, the driving device being operable to move the heat conducting gas to circulate within the circuit;
f) a fluid cooling circuit, containing heat conducting fluid, connected to the gas circuit, the fluid circuit having a pump for moving fluid therethrough;
g) a separation tower integral to the gas and fluid circuits, the separation tower having a reservoir of heat conducting fluid therein; and
h) an aerosol generator connected to the gas and fluid circuits, whereby the aerosol generator atomizes the heat conducting fluid, combines the atomized fluid with the heat conducting gas and moves the combined heat conducting gas and atomized fluid to the cooling chamber for extracting heat from the image projecting device.
6. Apparatus for cooling a light beam, comprising:
a) a light beam source that projects a light beam and radiates heat;
b) a gas cooling circuit filled with a heat conducting gas and having a driving device for moving the gas therethrough;
c) a cooling chamber which is integral to the gas cooling circuit and is placed in the light beam;
d) an image projection device mounted in the cooling chamber;
e) the gas being a heat conducting gas, the driving device being operable to move the heat conducting gas to circulate within the circuit:
f) a fluid circuit, containing a heat conducting fluid, connected to the gas circuit, the fluid circuit having a pump for moving fluid therethrough;
g) a secondary cooling circuit integral to the fluid circuit for cooling the fluid in the fluid circuit;
h) a separation tower connected to the gas and fluid circuits, the separation tower having a reservoir of heat conducting fluid therein; and
i) an aerosol generator connected to the gas and fluid circuits, whereby the aerosol generator atomizes the heat conducting fluid, combines the atomized fluid with the heat conducting gas and moves the combined heat conducting gas and atomized fluid to the cooling chamber for extracting heat from the image projecting device.
Description
FIELD OF THE INVENTION

This invention relates generally to light beam projectors for stage, theater and studio use and more particularly to apparatus for cooling the light beam so that it does not damage an image producing device which has heat sensitive limitations.

BACKGROUND OF THE INVENTION

Various devices have been used in an attempt to provide a relatively cool light beam to limit some of the heat problems associated with lighting apparatus and in particular, in stage lighting apparatus. Most of the heat is generated from the infrared portion of the beam. One such attempt includes a reflector made of heat resistant glass coated on one side facing the lamp with a multi-layer dielectric film forming a "cold mirror". This device reflects visible light and allows heat rays to pass through the film.

In the past, a reflector such as that described above has been thermally connected to a heat sink. In this manner, rays directed at the reflector pass through the film and glass or other suitable substrate of the reflector and strike the heat sink which absorbs the rays as heat.

Another attempt utilizes a multi-layer dielectric interference filter, i.e. a dichroic "hot mirror" and a liquid cell placed in the light beam to remove energy, in the infrared region, from the beam. The hot mirror functions to reflect "near" infrared energy while passing light in other regions. The water in the liquid cell is effective in absorbing the "far" infrared energy that is not reflected by the dichroic filter.

This combination removes infrared radiation from the beam before it reaches, for example, a commonly used special effects apparatus such as an image projection device known as a gobo or an LCD. Although water is used in this liquid cell, hydrocarbons have also been used, i.e. glycol and water-glycol mixes. However, these liquids are limited by their tendency to chemically break down after prolonged use, thus changing color. This color change can interfere with the projected image.

The foregoing illustrates limitations of the know prior art. Thus it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the limitations as set forth above. Accordingly, a suitable alternative is provided including features and benefits more fully disclosed hereinafter.

SUMMARY OF THE INVENTION

In one aspect of the present invention, this is accomplished by providing an apparatus for cooling a light beam comprising a light beam source, a gas cooling circuit, a cooling chamber connected to conduct a gas through the circuit, an image projecting device mounted in a chamber, the chamber having a thermally protected environment, a driving device and a heat conducting gas, the driving device being operable to move the heat conducting gas to circulate within the circuit.

The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing figures. It is to be expressly understood, however, that the figures are not intended as a definition of the invention, but are for the purpose of illustration only.

BRIEF DESCRIPTION OF THE DRAWING FIGURES

FIG. 1 is a diagrammatic view illustrating an embodiment of a system to be used in connection with the present invention;

FIG. 2 is a diagrammatic view illustrating an embodiment of a cooling chamber of the present invention;

FIG. 3 is a diagrammatic view illustrating an embodiment of a cooled lamp of the present invention;

FIG. 4 is another diagrammatic view illustrating an embodiment of the cooled lamp of the present invention;

FIG. 5 is a diagrammatic view illustrating another embodiment of the present invention;

FIG. 6 is a diagrammatic view illustrating a further embodiment of the present invention; and

FIG. 7 is a diagrammatic view illustrating a still further embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The apparatus for cooling a light beam is illustrated in FIG. 1 in a system which includes a light beam source such as a lamp 10 having a reflector 12 for directing a beam of light, designated B, on an image projection device 14, such as an LCD or modified to utilize a digital micro-mirror device (DMD) suitably mounted in a cooling chamber 16. A well-known infrared filter 18 including a dichroic film 19 may be placed in the beam B to remove heat from the beam by reducing infrared, i.e. by reflecting near infrared while transmitting shorter wavelengths. Similarly, a suitable film 11 may be placed on a surface of chamber 16.

In the preferred embodiment of FIG. 1, the apparatus for cooling light beam B includes a closed loop cooling circuit 30. Cooling chamber 16 is connected to conduct a cooling fluid moving through circuit 30. Image projection device 14, is mounted in the chamber 16, see also FIG. 2. The chamber 16 has a thermally protected environment due to circulation of the cooling fluid such as a heat conducting gas, discussed below. A driving device 32, e.g. a compressor, such as a suitable, commercially available diaphragm type compressor, is operable to move the heat conducting gas 34, preferably Helium, to circulate within the circuit 30 in the direction of arrows designated G. Compressor 32 can be on either the upstream or downstream side of chamber 16, with respect to the movement of the Helium.

Cooling exchange tower 26 contains a supply of water 36. The water 36 is pumped by a suitable low pressure pump 38 through a conduit 41 of a water cooling circuit 40 across a heat exchanger 42 where heat is removed and the cooled water 36 is returned to tower 26 as indicated by the directional arrows designated W. At the same time, the Helium 34 is being moved through tower 26 by driving device 32. As the Helium 34 passes through tower 26, the Helium 34 is cooled by the water 36. To enhance cooling of the Helium 34, it is preferred to disperse as many Helium bubbles through the water as possible. This is accomplished by providing a plenum 43 which receives the Helium 34 from a conduit 44 of circuit 30 and releases the Helium 34 through the water 36 via several outlet jets 46 which disperse the Helium bubbles 34 through the water 36 with sufficient contact time to cool the Helium 34. The cooled Helium 34 is moved through conduit 44 from tower 26 and returned to the cooling chamber 16 where it extracts heat from the image projection device 14 thus providing a thermally protected environment for device 14 in chamber 16. The heated Helium 34 is then recirculated by compressor 32, and the cycle is repeated.

Alternatively, as shown in FIGS. 3 & 4, a water cooling device may be incorporated with lamp 10 to remove heat by a water circulation method, whereby water 36 from exchange tower 26 is circulated, as indicated by the directional arrows designated W, through a chamber 39 defined by a glass dome 22 adjacent lamp 10. Furthermore, a dichroic coating 24 similar to the film 19 used on filter 18, can be placed on a suitable surface of dome 22 for added heat reduction. This will function as a hot mirror reflecting "near" infrared into the water moving through chamber 39. Another coating 25 of dichroic film may be used on a suitable surface of dome 22 adjacent base 27 of lamp 10 to reflect visible light and pass infrared to be cooled by the water moving through chamber 39. Water circulated through dome 22 may be driven by a suitable low pressure pump 21 and conducted from cooling exchange tower 26 via a conduit 28 including a heat exchanger 29. The filter 18 and/or the dome 22 water circulation device can be used to cool beam B in combination with any of the embodiments described herein assuming suitable modifications are provided.

In another embodiment, as shown in FIG. 5, the apparatus for cooling a light beam B includes closed loop cooling circuit 130. Cooling chamber 116 is connected to conduct fluid moving through circuit 130. Image projection device 114, is mounted in chamber 116. The chamber 116 has a thermally protected environment due to circulation of a heat conducting gas 134 moving through circuit 130 as indicated by the directional arrows designated G. Compressor 132 is operable to move the heat conducting gas 134, which is preferably a fluorine containing refrigerant such as octafluoropropane (C3 F8) in this embodiment, to be circulated within circuit 130, where heat exchanger 142 removes heat from the refrigerant 134 as the refrigerant circulates in circuit 130. The cooled refrigerant 134 is moved through circuit 130 from heat exchanger 142 and returned to cooling chamber 116 where it extracts heat from the image projection device 114 thus providing a thermally protected environment for device 114 in chamber 116. The heated refrigerant 134 is then recirculated by compressor 132, and the cycle is repeated.

The thermally protected environment in chamber 216, FIG. 6, includes an atmosphere of an atomized, heat conducting fluid. This is accomplished by an additional circuit 240, connected to circuit 230, and driven by a suitable low pressure liquid pump 238, a separation tower 252, containing a heat conducting fluid 254 such as water or alternatively, a fluorocarbon such as perfluorohexane (C6 F14), and an aerosol generator 256, such as model number 646 Jet Nebulizer, manufactured by DeVilbiss. The aerosol generator 256 receives the compressor driven heat conducting gas, i.e. Helium 234, from conduit 244 and also receives the heat conducting fluid 254 from conduit 241 of circuit 240. The heat conducting fluid 254 is nebulized, i.e. atomized in the aerosol generator 256 and combines with the heat conducting gas 234 in the generator 256. This combination is conducted to the cooling chamber 216, assisted by a compressor 232, where it extracts heat from the image projection device 214. The heated combination is conducted via conduit 244 to a heat exchanger 242 where heat is removed. The cooled combination, i.e. Helium 234 and heat conducting fluid 254, is then conducted via conduit 244 to separation tower 252 where the heat conducting fluid 254 and Helium 234 separate, the heat conducting fluid 254 is pumped back to the aerosol generator 256 via conduit 241, the Helium 234 is compressed and returned to generator 256 via conduit 244 and the cycle is repeated.

In another embodiment, the thermally protected environment in chamber 316, FIG. 7, includes an atmosphere of atomizer, heat conducting fluid. This is accomplished by an additional circuit 340 connected to circuit 330 and driven by a suitable low pressure liquid pump 338, a separation tower 352 containing a heat conducting fluid 354 such as water or alternatively, a fluorocarbon such as perfluorohexane (C6 F14), and an aerosol generator 356.

The aerosol generator 356 receives the compressed heat conducting gas, i.e. Helium 334, from conduit 344 and also receives the heat conducting fluid 354 from conduit 341 of circuit 340. The heat conducting fluid 354 is nebulized, i.e. atomized in the aerosol generator 356 and combines with the Helium 334 in the generator 356. This combination is conducted to the cooling chamber 316 where it extracts heat from the image projection device 314. The heated combination is conducted via conduit 344 to a heat exchanger 342 where heat is removed. The cooled combination, i.e. Helium 334 and heat conducting fluid 354, is then conducted via conduit 344 to separation tower 352 where the heat conducting fluid 354 and Helium 334 separate, and the Helium 334 is compressed and returned to the generator 356 via compressor 332 and conduit 344. The heat conducting fluid 354 is conducted to a cooling tower 360 where additional cooling takes place. Cooling tower 360 is in an additional cooling circuit 370 which contains a heat exchanger 372, a compressor 374 and a hydrofluorocarbon (HFC) 376 such as a commercially available fluorine containing refrigerant designated R-404A, which is pumped through the cooling tower 360 to additionally cool the heat conducting fluid 354. The heat conducting fluid 354 is then pumped back to the aerosol generator 356 via pump 338 and the cycle is repeated. This additional cooling step lowers the temperature of the heat conducting fluid 354 below ambient to achieve better heat removal in the cooling chamber.

While this invention has been illustrated and described in accordance with a preferred embodiment, it is recognized that variations and changes may be made therein without departing from the invention as set forth in the claims.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1895887 *Dec 20, 1929Jan 31, 1933Westinghouse Lamp CoIncandescent electric lamp
US2943534 *Jun 11, 1957Jul 5, 1960Kamera & Kinowerke Dresden VebFilm projector device
US3193001 *Feb 5, 1963Jul 6, 1965Lithonia Lighting IncComfort conditioning system
US3914010 *Nov 25, 1974Oct 21, 1975Us ArmyLiquid long-wave pass filter for high intensity light source
US4843529 *Dec 16, 1987Jun 27, 1989Lehigh UniversityStage lighting apparatus
US4890208 *Feb 10, 1989Dec 26, 1989Lehigh UniversityStage lighting apparatus
US5147130 *Nov 2, 1989Sep 15, 1992Orc Manufacturing Co., Ltd.Cooling liquid recirculation system for light source unit
US5282121 *Apr 30, 1991Jan 25, 1994Vari-Lite, Inc.High intensity lighting projectors
US5497573 *Apr 14, 1994Mar 12, 1996Stadjuhar; Robert C.Thermally-protected display with a ventilation system
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5805255 *Feb 6, 1996Sep 8, 1998Pioneer Electronic CorporationLiquid-filled optical device
US5828485 *Feb 7, 1996Oct 27, 1998Light & Sound Design Ltd.Programmable light beam shape altering device using programmable micromirrors
US5940204 *Oct 17, 1997Aug 17, 1999Light & Sound Design, Ltd.Programmable light beam- shaped altering device using programmable digital micromirrors
US5953151 *Oct 31, 1997Sep 14, 1999Light & Sound Design, Ltd.Programmable light beam shape altering device using programmable micromirrors
US5953152 *Sep 23, 1997Sep 14, 1999Light & Sound Design, Ltd.Programmable light beam shape altering device using programmable micromirrors
US6126288 *Oct 24, 1997Oct 3, 2000Light & Sound Design, Ltd.Programmable light beam shape altering device using programmable micromirrors
US6288828Jul 21, 1999Sep 11, 2001Light And Sound Design Ltd.Programmable light beam shape altering device using programmable micromirrors
US6421165Aug 9, 2001Jul 16, 2002Light & Sound Design Ltd.Programmable light beam shape altering device using programmable micromirrors
US6771411Jul 16, 2002Aug 3, 2004Production Resource Group Inc.Programmable light beam shape altering device using programmable micromirrors
US6984830Jun 12, 2002Jan 10, 2006Burgio Joseph TApparatus for limited-heat curing of photosensitive coatings and inks
US7224509Feb 24, 2003May 29, 2007Production Resource Group, L.L.C.Programmable light beam shape altering device using programmable micromirrors
US7309145 *Jan 10, 2005Dec 18, 2007Seiko Epson CorporationLight source apparatus and projection display apparatus
US7515367Feb 28, 2006Apr 7, 2009Production Resource Group, LlcMethod of controlling a lighting device
US7535622May 11, 2007May 19, 2009Production Resource Group, LlcProgrammable light beam shape altering device using programmable micromirrors
US8009374Aug 30, 2011Production Resource Group, LlcProgrammable light beam shape altering device using programmable micromirrors
US8022954Sep 20, 2011Production Resource Group, L.L.CProgrammable light beam shape altering device using separate programmable micromirrors for each primary color
US8217557 *Jul 10, 2012Micron Technology, Inc.Solid state lights with thermosiphon liquid cooling structures and methods
US8314800Sep 20, 2011Nov 20, 2012Production Resource Group Inc.Programmable light beam shape altering device using separate programmable micromirrors for each primary color
US8569942Dec 1, 2010Oct 29, 2013Sharp Kabushiki KaishaVehicle headlamp and illuminating device
US8733996May 16, 2011May 27, 2014Sharp Kabushiki KaishaLight emitting device, illuminating device, and vehicle headlamp
US8833991Feb 8, 2011Sep 16, 2014Sharp Kabushiki KaishaLight emitting device, with light guide member having smaller exit section, and illuminating device, and vehicle headlight including the same
US8876344Jul 18, 2013Nov 4, 2014Sharp Kabushiki KaishaVehicle headlamp with excitation light source, light emitting part and light projection section
US8976441Aug 29, 2011Mar 10, 2015Production Resource Group, LlcProgrammable light beam shape altering device using programmable micromirrors
US9057514Jul 5, 2012Jun 16, 2015Micron Technology, Inc.Solid state lights with thermosiphon liquid cooling structures and methods
US20010036003 *Feb 22, 2001Nov 1, 2001Light And Sound Design Ltd.Programmable light beam shape altering device using separate programmable micromirrors for each primary color
US20030147117 *Feb 24, 2003Aug 7, 2003Light & Sound Design Ltd., A Great Britain CorporationProgrammable light beam shape altering device using programmable micromirrors
US20050168990 *Jan 10, 2005Aug 4, 2005Seiko Epson CorporationLight source apparatus and projection display apparatus
US20070211469 *May 11, 2007Sep 13, 2007Production Resource Group, L.L.C.Programmable light beam shape altering device using programmable micromirrors
US20090190203 *Apr 7, 2009Jul 30, 2009Production Resource Group L.L.CProgrammable light beam shape altering device using programmable micromirrors
US20110148280 *Jun 23, 2011Sharp Kabushiki KaishaVehicle headlamp and illuminating device
US20110194302 *Aug 11, 2011Sharp Kabushiki KaishaLight emitting device, illuminating device, and vehicle headlight
US20110280033 *Nov 17, 2011Sharp Kabushiki KaishaLight-emitting device, illumination device, and vehicle headlamp
US20120012282 *Jan 19, 2012Asetek A/SDirect air contact liquid cooling system heat exchanger assembly
Classifications
U.S. Classification362/294, 362/293, 362/373, 165/104.13, 348/E05.143, 165/104.21, 165/104.28
International ClassificationF21V29/02, G03B21/16, H04N5/74
Cooperative ClassificationF21V29/56, F21V29/30, F21W2131/406, F21V9/04, H04N9/3141, G03B21/16
European ClassificationF21V29/30, G03B21/16
Legal Events
DateCodeEventDescription
Oct 6, 1995ASAssignment
Owner name: HIGH END SYSTEMS, INC., TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ZIEGLER, BYRON J.;BELLIVEAU, RICHARD S.;REEL/FRAME:007789/0790
Effective date: 19951006
Jan 24, 1997ASAssignment
Owner name: LASALLE BUSINESS CREDIT, INC., ILLINOIS
Free format text: PATENT, TRADEMARK AND LICENSE MORTGAGE;ASSIGNOR:HIGH END SYSTEMS, INC.;REEL/FRAME:008321/0793
Effective date: 19961210
Jan 27, 1997ASAssignment
Owner name: HIGH END SYSTEMS, INC., TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ZIEGLER, BYRON J.;BELLIVEAU, RICHARD S.;REEL/FRAME:008486/0146
Effective date: 19970127
Jan 23, 2001FPAYFee payment
Year of fee payment: 4
Jan 23, 2001SULPSurcharge for late payment
Jan 25, 2005SULPSurcharge for late payment
Year of fee payment: 7
Jan 25, 2005FPAYFee payment
Year of fee payment: 8
Aug 28, 2007ASAssignment
Owner name: HIGH END SYSTEMS INC., TEXAS
Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:LASALLE BUSINESS CREDIT, LLC;REEL/FRAME:019754/0036
Effective date: 20070827
Oct 16, 2007ASAssignment
Owner name: HIGH END SYSTEMS, INC., TEXAS
Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:MARQUETTE BUSINESS CREDIT, INC.;REEL/FRAME:019965/0065
Effective date: 20071011
Oct 23, 2007ASAssignment
Owner name: WACHOVIA BANK, NATIONAL ASSOCIATION, TEXAS
Free format text: SECURITY AGREEMENT;ASSIGNOR:HIGH END SYSTEMS, INC.;REEL/FRAME:019995/0252
Effective date: 20070926
Dec 9, 2008ASAssignment
Owner name: BARCO LIGHTING SYSTEMS, INC., TEXAS
Free format text: CHANGE OF NAME;ASSIGNOR:HIGH END SYSTEMS, INC.;REEL/FRAME:021936/0768
Effective date: 20080717
Jan 15, 2009FPAYFee payment
Year of fee payment: 12
Jan 19, 2009REMIMaintenance fee reminder mailed